<form id="need_info_form" name="need_info_form" method="post" action="" onsubmit="return false;">
  <table style="margin:10px;">
    {$html}
    <tr>
	 <td>&nbsp;</td>
      <td><input type="button" id="Submit" name="Submit" value="提交" onclick="add();" class="btnText"></td>
    </tr>
  </table>
</form>
<script type="text/javascript">
function add() {
	var post_data = $('#need_info_form').serialize();
	$.post(
		"ajax.php?mod=event&code=need_info&id=$id",
		{post_data},
		function(r){
			if(r.done){
				closeDialog('need_info');
				simpleTalk();
			}else{
				MessageBox('warning', r.msg);
			}
			},'json'
	);
}
</script>